A lot of the stuff up above is good advice. Especially the stuff about proper mx records. I have been able to completely eliminate the issue of AOL, MSN Yahoo etc. thinking they see spam coming from my server by throttling all mail that goes out of the box. No clients are allowed to send email blasts. They all run it thru a trickler app and as a result skate safely under the radar of every frequency filter out there to date. I have some clients -- professional associations -- whose memberships are just freakin' loaded with AOL, Hotmail etc. They do mailings in the 5-10,000 piece range with nothing coming back due to a temp block (stuff like "could not deliver because user does not exist" when you know it does in fact exist and later, on retry, the mail goes thru). Same goes for a commercial vendor sending out daily alert-type emails showing product in inventory matching a requested profile. Those are 10-100k html emails... No problems.
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